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Best practices for long-run LED strip installs (20–50M) to avoid flicker?

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Best practices for long-run LED strip installs (20–50M) to avoid flicker?

#1

Post by emmasuntech »

I’m working on a long-run LED strip installation (think 20–50 meters) and I’m trying to keep brightness and color consistent end-to-end. On typical constant-voltage strips, the far end dims and “white” shifts, and under high load I sometimes see flicker.

So far I’ve tried the usual: higher voltage rails (e.g., 24V), thicker feeder wires, cleaner connectors, and power injection. It helps, but I’m curious what approaches people here consider “best practice” for reliability and serviceability.

Questions:

For long runs, do you prefer distributed power injection vs multiple smaller PSUs vs a higher-voltage backbone + local regulation?

Have you had good results with constant-current strips or per-segment regulation to reduce voltage-drop artifacts?

For addressable strips (WS281x/SPI/DMX), what are your go-to fixes for signal integrity over distance (grounding, buffering, differential, level shifting)?

Any rules of thumb for wire gauge, injection spacing, and PSU headroom that have held up in real installs?

I’m not looking for product recommendations as much as engineering patterns that scale and don’t become a maintenance nightmare. Would love to hear what’s worked (and what didn’t).

Re: Best practices for long-run LED strip installs (20–50M) to avoid flicker?

#4

Post by jwrallie »

How about measuring voltage across the strip and modeling the system resistance (per meter)?

You can measure the voltage where you are observing problems to understand your margins.

Your solutions are sound, you just need to throw in some math to optimize them to each application.

Re: Best practices for long-run LED strip installs (20–50M) to avoid flicker?

#7

Post by sen »

I’ve done multiple projects that use 20m+ of WS2812s.

I deliver the main power in segments from a single large PSU and run 5v signal (despite being designed for 3.3v signal most will handle 5v fine and works better for longer strips).

Running segments with connectors also makes it easier to swap out failed segments.

Re: Best practices for long-run LED strip installs (20–50M) to avoid flicker?

#8

Post by herczegzsolt »

I've not quiet worked with that long LEDs, but i have experience with 10-20m length indoor installations.

For our standards, we supply the strips with power at both ends and at every 5m in-between. (So an LED is at most 2.5m away from a supply). Your supply needs may vary significantly depending on the type of LED you use, these numbers worked for us on WS2812B 60led/m at 5V rail voltage.

> For long runs, do you prefer distributed power injection vs multiple smaller PSUs vs a higher-voltage backbone + local regulation?

Either should work fine, but when you use multiple PSUs or regularors, you may need to match their output voltage suprisingly precisely to get good results. A pair of thick copper wires is often easier.

> For addressable strips (WS281x/SPI/DMX), what are your go-to fixes for signal integrity over distance (grounding, buffering, differential, level shifting)?

WS28xx has built-in "reclocking" as long as your longest distance between two adjacent leds is SPI is a nightmare over any distance. DMX is great if you respect the standard in terms of cabling and unit loads, but it i'm yet to see a DMX-enabled individually addessable LED strip. A DMX universe would be limited to 170 rgb or 128rgbw leds anyway.

> engineering patterns that scale and don’t become a maintenance nightmare.

Use a projector or a TV instead :-D

Re: Best practices for long-run LED strip installs (20–50M) to avoid flicker?

#10

Post by formichunter »

I designed my led system at home in the basement which is not as big but same principle. It all depends on: 1. Distance 2. Type of LED: W, RGB, RGBW, RGBWCCT 3. Brand of LED manufacturer 4. Number of LED per meter aka amperage draw 5. 24v verse 12v

If this is a loop, like a rectangle, you can inject from beginning and end since that is the same point, otherwise, you'll need power injected at some distance. For long distances you'll need to calculate the power loss to figure that out. I used quinled.info site to get all this information and decided upon an RGBW LED setup using 24 volts and injecting at beginning and end of rectangle. This was for 20 meters, fyi, not 50 meters. RGBWCCT was too much amperage draw over distance and this was my first time doing it. Learn how to solder because using the snap-on connectors suck...I am redoing those connectors by soldering b/c two have failed so far.

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